Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Today's Forecast
Windy, walking impeded
Blustery conditions enough to give buffeting on higher terrain or affect balance on exposed ridges. 25 to 40mph.
Patchy rain or drizzle
Rain on and off, or generally drizzly - total amounts small, but may be persistently damp, especially where hills are shrouded in cloud.
Cold
Air temperature below freezing all day on higher mountains. Significant chill factor if exposed to strong winds. Suitable protective clothing required.
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Windy, walking impeded
Blustery conditions enough to give buffeting on higher terrain or affect balance on exposed ridges. 25 to 40mph.
Patchy rain or drizzle
Rain on and off, or generally drizzly - total amounts small, but may be persistently damp, especially where hills are shrouded in cloud.
Cold
Air temperature below freezing all day on higher mountains. Significant chill factor if exposed to strong winds. Suitable protective clothing required.
Viewing Forecast For
Eryri / Snowdonia National Park
Saturday 29th March 2025
Last updated
Fri 28th Mar 25 at
4:04PM
Summary for all mountain areas
Deteriorating rapidly as a front, particularly active in western Scotland, brings precipitation and upland gales - or on Scottish highlands storm force winds. Heavy snow for a few hours mainly western Scotland, mostly rain elsewhere. Total rainfall small south toward S Pennines and Wales
Headline for Eryri / Snowdonia National Park
Deteriorating afternoon: becoming very windy; rain and lowering cloud.
How windy? (On the summits)
Westerly 15mph or less after dawn. Through day strengthening to 25-30mph by midday and by late afternoon 35-40mph - highest speeds Snowdon range.
Effect of the wind on you?
Mostly small morning. Then walking arduous with considerable buffeting and wind chill where exposed.
How Wet?
Pockets or rain later afternoon onwards
Substantially dry. But bursts of rain and drizzle toward evening most likely Snowdon range - perhaps sleet highest summits.
Cloud on the hills?
Probably extensive on highest tops
Cloud base typically 600 to 900m by late morning (lowest westernmost summits). Will lower, most pronounced western mountains toward evening, where cloud below 400m and 600m elsewhere.
Chance of cloud free summits?
60% later 10%
Sunshine and air clarity?
Patches of sunshine, mainly east Wales will tend to give way as cloud thickens afternoon. Very good or excellent visibility.
How Cold? (at 900m)
-1 rising to freezing point around midday then 3C through afternoon. Will feel as cold as minus 10C directly in the wind.
Freezing Level
800m at first; above the summits by mid afternoon.
Viewing Forecast For
Eryri / Snowdonia National Park
Sunday 30th March 2025
Last updated
Fri 28th Mar 25 at
4:04PM
How windy? (On the summits)
Northwest backing westerly, slowly easing from 30 to 45mph on highest tops post dawn to 25 to 30mph evening.
Effect of the wind on you?
Considerable buffeting and wind chill higher up, in places balance difficult, particularly morning.
How Wet?
Rain very unlikely
Small risk of a little drizzle near the west coast by dusk.
Cloud on the hills?
Confined to higher tops: may clear nearly all summits afternoon
By late morning cloud base typically 650 to 800m lowest toward the coast. Cloud base may lift to 900m or above afternoon. Toward dusk, near Lleyn peninsula cloud may begin to form on lower slopes.
Chance of cloud free summits?
60% afternoon
Sunshine and air clarity?
Patchy sunshine; most sun lower slopes east Wales. Slight haze.
How Cold? (at 900m)
4C Rising slowly through the day. Will feel as cold as minus 8C directly in the wind.
Freezing Level
Above the summits
Viewing Forecast For
Eryri / Snowdonia National Park
Monday 31st March 2025
Last updated
Fri 28th Mar 25 at
4:04PM
How windy? (On the summits)
Mostly west or southwesterly (although direction may vary) 10 to perhaps 15mph Snowdon range.
Effect of the wind on you?
Mostly negligible
How Wet?
Rain very unlikely
Chance pockets of fine drizzle morning between Snowdon and Lleyn peninsula.
Cloud on the hills?
Most summits gradually clearing, possibly persisting near Lleyn peninsula
Confidence low: Fragments of, or extensive very low cloud, west Wales morning, particularly Snowdon to Lleyn peninsula. Higher slopes may be above the cloud. Through day will tend to mostly or perhaps all break up - timing uncertain.
Chance of cloud free summits?
40% rising to 80%
Sunshine and air clarity?
Sunshine increasingly, although may remain substantially dull Snowdon to Lleyn peninsula - though perhaps higher slopes in sunshine above fog. Very good or in afternoon excellent visibility.
How Cold? (at 900m)
7C
Freezing Level
Above the summits.
Planning Outlook
Pressure will rise across the UK early next week, bringing extensively dry and for a few days very warm weather - albeit on Monday the remnants of fronts will bring a little rain but extensive low cloud to some western mountains. Later next week, some forecasts suggest a marked drop in temperature levels as the high pressure shifts position to the north of Scotland.